Sahih Muslim
The Book of Pilgrimage (Kitab Al-Hajj)
Book Number: 007 / Hadith Number: 2790
Abd al-Rahman b. Abu Bakr reported that the Apostle of Allah (may peace be upon him) ordered him to mount A'isha behind him and enable her to (enter into the state of Ibrim for 'Umra) at Tan'im.